Mechanical Engineering Quiz 24

1 / 50

The ratio of specific weighf/h.p. of gas turbin and I.C engines may be typically of the order of_______________________?

2:01

1:06

1:01

4:01

2 / 50

Which of the following is a fire tube boiler________________?

Stirling boiler.

locomotive boiler

all of the above

Babcock and Wilcox boiler

3 / 50

Pressurised water reactor is designed________________?

for boiling pi water in the core

to use intermediate coolant

to use liquid sodium metal as coolant

to prevent the water coolant from boiling in the core

4 / 50

Klein?s construction can be used when_________________?

crank has uniform angular acceleration

crank has a uniform angular velocity

crank has uniform angular velocity and angular acceleration

crank has non-uniform velocity

5 / 50

The function of injector used in small steam plants is to________________?

create vacuum in furnace

create vacuum at turbine exhaust

pump feed water

dose chemicals in feed water

6 / 50

Which of the following is a case of steady state heat transfer ___________________?

air preheaters

All

none of the above

heating of building in winter

7 / 50

The inlet value of a four stroke cycle I.C engine remains open for nearly___________________?

180?

125?

200?

235?

8 / 50

Clearance volume in actual reciprocating compressors is essential __________________?

to attain high volumetric efficiency

to provide cushioning effect and also to avoid mechanical bang of piston with cylinder head

to provide cushioning effect

to accommedate Valves in the cylinder head

9 / 50

Method of governing used in petrol engine is________________?

combined governing

partial governing

quality governing

quantity governing

10 / 50

The edges of the plates for cylindrical vessels are usually bevelled to an angle of 80? for_________________?

safety

ease of manufacture

reducing stress concentration

fullering and caulking

11 / 50

A typewriter mechanism has 7 number of binary joints, six links and none of higher pairs. The mechanism is________________?

kinematically sound

data is not sufficient to determine same

soundness would depend upon which link is kept fixed

not sound

12 / 50

Cupola produces following material__________________?

pig iron

malleable iron

wrought iron

cast iron

13 / 50

Scavenging is usually done to increase__________________?

fuel consumption

power output

thermal efficiency

speed

14 / 50

Deaeration of feed water is carried out because it reduces ____________________?

cavitation of .boiler feed pumps

pH value of water

corrosion caused by oxygen

heat transfer coefficient

15 / 50

The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is__________________?

may be less or more depending on temperature

less

equal

16 / 50

Unit of thermal conductivity in M.K.S. units is ___________________?

kcal/kg m2 ?C

kcal-m/hr m2 ?C

kcal-m/hr ?C

kcal/hr m2 ?C

17 / 50

Mass flow ratio of NH3 in comparison to Freon-12 for same refrigeration load and same temperature limits is of the order of___________________?

1:09

1:03

1:01

9:01

18 / 50

Machining properties of steel are improved by adding___________________?

vanadium, aluminium

chromium, nickel

silicon, aluminium, titanium

sulphur, lead, phosphorous

19 / 50

Machine screws are________________?

similar to stud

similar to small size tap bolts except that a greater variety of shapes of heads are available

used to prevent relative motion be-tween two parts

slotted for a screw driver and generally used with a nut

20 / 50

Highest pressure encountered in a refrigeration system should be________________?

much above critical pressure

much below critical pressure

near critical pressure

critical pressure of refrigerant

21 / 50

Cavitation will begin when__________________?

flow is increased

pressure is increased

pressure becomes more than critical pressure

the pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid

22 / 50

As the value of index ??? is decreased, the volumetric efficiency will___________________?

may increase/decrease depending on compressor clearance

decrease

increase

remain unaffected

23 / 50

Pick up the false statement ?

High speed compression engines operate on dual combustion cycle

Theoretically correct mixture of air am petrol is approximately 15 : 1

S.I. engines are quality-governed engines

Thermal efficiency of diesel engine i about 34%

24 / 50

It equal and opposite forces applied to a body tend to elongate it, the stress so produced is called______________________?

internal resistanpe

compressive stress

tensile stress

transverse stress

25 / 50

A pressure of 25 m of head of water is equal to_________________?

245 kN/m2

2.5kN/m2

2500 kN/m2

25 kN/m2

26 / 50

The overall isothermal eiffciency of compressor is defined as the ratio of_______________?

work to compress air isothermally to work for actual compression

isothermal h.p. to the BHP of motor

isothermal h.p. to adiabatic h.p.

power to drive compressor to isothermal h.p.

27 / 50

It is required to produce large amount of steam at low pressure. Which boiler should be used ?

babcock and wilcox boiler

lancashire boiler

cochran boiler

pulverised fuel fired boiler

28 / 50

When a piping system is made up primarily of friction head and very little of vertical lift, then pump characteristics should be__________________?

horizontal

steep

first rise and then fall

nearly horizontal

29 / 50

The force acting along the circumference will cause stress in the walls in a direction normal to the longitudinal axis of cylinder; this stress is called___________________?

longitudinal stress

yeiled stress

hoop stress

ultimate stress

30 / 50

An event is indicated on the network by_________________?

a straight line

a number enclosed in a circle or a square

a straight line with circles at the ends

a dotted line

31 / 50

Two systems shall be dynamically equivalent when____________________?

M.I. of two about an axis through e.g. is equal

the mass of two are same

all of the above

e.g. of two coincides

32 / 50

The flow in which the velocity vector is identical in magnitude and direction at every point, for any given instant, is known as________________?

steady flow

uniform flow

turbulent flow

one dimensional flow

33 / 50

Which of the following organisation is preferred in automobile industry________________?

staff organisation

line and staff organisations

line organisation

functional organisation

34 / 50

For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately________________?

0.7 times

0.8 times

0.6 times

0.4 times

35 / 50

The critical activity has____________________?

average float

zero float,

minimum float

maximum float

36 / 50

If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle___________________?

equal

less

depends on other factors

37 / 50

The capacity of induced draft fan compared to forced draft fan in a boiler is__________________?

less or more depending on size of boiler

same

less

38 / 50

The absolute acceleration of any point P in a link about center of rotation 0 is___________________?

perpendicular to PO

along PO

at 45? to PO

none of the above

39 / 50

In Vicker?s hardness testing, the pyramid indentor apex is__________________?

40?

136?

152?

122?

40 / 50

For economical operation of a nuclear plant__________________?

moderator should be used

coolant should be employed

used fuel should be reprocessed

control rods should be used

41 / 50

The percentage of carbon in low carbon steel is__________________?

0.50%

0.15%

0.30%

0.05%

42 / 50

Mechanical equivalent of heat for 1 kcal or Joule?s equivalent is equal to_________________?

539 kgm

102 kgm

421 kgm

43 / 50

According to Clausis statement of second law of thermodynamics___________________?

heat can be transferred for low temperature to high temperature source by using refrigeration cycle.

heat can?t be transferred from low temperature to high temperature source without the aid of external energy

heat can be transferred from low temperature to high temperature source if COP of process is more than unity

heat can?t be transferred from low temperature source to high temperature source

44 / 50

Which of the following is the unit of kinematic viscosity _________________?

pascal

poise

stoke

faraday

45 / 50

A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm2 and a volume of 0.039 m3 at 150 kg/cm2. The bulk modulus of elasticity of liquid is___________________?

4000 kg/cm2

40 x 105 kg/cm2

40 x 106 kg/cm2

400 kg/cm2

46 / 50

Euler?s dimensionless number relates the following__________________?

viscous force and inertial force

viscous force and buoyancy force

inertial force and gravity

pressure force and inertial force

47 / 50

The size of a boiler drum in pulverised fuel fired boiler,as its size and capacity, (steam pressure and flow ratings) increase __________________?

increases

increases/decreases depending on steam temperature requirements

remains unchanged

decreases

48 / 50

In fast breeder reactors___________________?

moderator is dispensed with

heavy water is used as the moderator

any type of moderator can be used

graphite is used as the moderator

49 / 50

Which type of boiler can meet rapid changes of load____________________?

horizontal fire tube type

vertical fire tube type

horizontal water tube type

forced circulation type

50 / 50

Pick up the correct statement from the following?

critical path method is an improvement upon bar chart method

critical path method provides a realistic approach to the daily problems

all of the above

critical path method avoids delays which are very common in bar chart

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